Ninthore Overseas Is One Of The Leading Manufacturer And Exporter Of High Quality Duplex Steel S31803 Nipple, which should be allowed to cool to below 300 Degree F between welding passes. Whenever hot forming is done, Duplex Steel S31803 Hexagon Reducing Nipple should be followed by a full solution anneal at 1900 Degree F minimum and rapid quench to restore phase balance, toughness, and corrosion resistance. Stress relieving is not required or recommended; however, if it must be performed, Duplex S32205 Hexagon Nipple should receive a full solution anneal at 1900 Degree F minimum, followed by rapid cooling or water quenching.

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Duplex Steel S31803 Nipple

Duplex Steel S31803 Nipple

Stress relief treatments at any lower temperature for Duplex S31803 One End Threaded Nipple carry the risk of precipitation of detrimental intermetallic or non – metallic phases. As with all stainless steels, such as for Duplex Steel S32205 Both End Threaded Nipple, good joint preparation, alignment, and cleaning are essential for good quality welds. Pre – heating of Duplex Steel S31803 Concentric Swaged Nipple is not necessary or desirable unless it is used only to prevent condensation, or in certain unusual cases involving connecting very light sections to very heavy sections.

Hot cracking is not impossible but is much less likely to occur with Duplex Steel S32205 Eccentric Swaged Nipple than with austenitic materials. Weld zones in Duplex S32205 Nipple should be clean before welding and well shielded by inert gas, typically dry argon, during welding.

Duplex Steel UNS S31803 / S32205 Nipple
Specifications : ASTM A182 & ASME SA182
Size : 1/4″ to 4″
Class : 2000 LBS, 3000 LBS, 6000 LBS, 9000 LBS
Duplex Steel S31803 / S32205 Nipple Chemical Composition
S31803 / S32205 C N P Si Mn Mo Fe Cr S Ni
1.0 0.03 0.02 2.0 3.0 – 3.5 22.0 – 23.0 0.03 4.5 – 6.5 0.14 – 0.2 Bal
Duplex Steel UNS S31803 / S32205 Nipple Mechanical Properties
S31803 / S32205 Density Melting Point Yield Strength (0.2%Offset) Tensile Strength Elongation
7.8 g/cm3 1350 °C (2460 °F) Psi – 80000 , MPa – 550 Psi – 116000 , MPa – 800 15 %
Equivalent Grades for UNS S31803 / S32205 Nipple
Duplex S31803 S31803 1.4462
Duplex S32205 S32205 1.4462
Duplex Steel UNS S31803 / S32205 Nipple Application Industries
  • Off-Shore Oil Drilling Companies
  • Power Generation
  • Petrochemicals
  • Gas Processing
  • Specialty Chemicals
  • Pharmaceuticals
  • Pharmaceutical Equipment
  • Chemical Equipment
  • Sea Water Equipment
  • Heat Exchangers
  • Condensers
  • Pulp and Paper Industry
Duplex Steel S31803 / S32205 Nipple Test Certificates

We at Ninthore Overseas provide Manufacturer TC (Test Certificate) in accordance to EN 10204/3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report. We also provide Standard certificates like EN 10204 3.1 and additional requirement like. NACE MR 01075. FERRIT CONTENT as per norms if requested by clients.

• EN 10204/3.1B,
• Raw Materials Certificate
• 100% Radiography Test Report
• Third Party Inspection Report, etc

Material Testing

We at Ninthore Overseas ensure that all our materials go through strict quality tests before dispatching them to our clients.

• Mechanical Testing Such as Tensile of Area
• Hardness Test
• Chemical Analysis – Spectro Analysis
• Positive Material Identification – PMI Testing
• Flattening Test
• Micro and Macro Test
• Pitting Resistance Test
• Flaring Test
• Intergranular Corrosion (IGC) Test


• Commercial Invoice which includes HS Code
• Packing List including net weight and gross weight, number of boxes, Marks and Numbers
• Certificate of Origin legalized/attested by Chamber of Commerce or Embassy
• Fumigation Certificates
• Raw Material Test Reports
• Material Traceability Records
• Quality Assurance Plan (QAP)
• Heat Treatment Charts
• Test Certificates certifying NACE MR0103, NACE MR0175
• Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2
• Guarantee Letter
• NABL approved Laboratory Test Reports
• Welding Procedure Specification/Procedure Qualification Record, WPS/PQR
• Form A for the purposes of the Generalized System of Preferences (GSP)